content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.flowable.internal.operators;
  
  import static org.junit.Assert.*;
  
  import java.util.*;
  import java.util.concurrent.atomic.*;
  
  import org.junit.Test;
  
  import io.reactivex.common.exceptions.TestException;
  import io.reactivex.common.functions.*;
  import io.reactivex.flowable.*;
  import io.reactivex.flowable.subscribers.*;
  
  public class FlowableTakeLastOneTest {
  
      @Test
      public void testLastOfManyReturnsLast() {
          TestSubscriber<Integer> s = new TestSubscriber<Integer>();
          Flowable.range(1, 10).takeLast(1).subscribe(s);
          s.assertValue(10);
          s.assertNoErrors();
          s.assertTerminated();
          // NO longer assertable
  //        s.assertUnsubscribed();
      }
  
      @Test
      public void testLastOfEmptyReturnsEmpty() {
          TestSubscriber<Object> s = new TestSubscriber<Object>();
          Flowable.empty().takeLast(1).subscribe(s);
          s.assertNoValues();
          s.assertNoErrors();
          s.assertTerminated();
          // NO longer assertable
  //      s.assertUnsubscribed();
      }
  
      @Test
      public void testLastOfOneReturnsLast() {
          TestSubscriber<Integer> s = new TestSubscriber<Integer>();
          Flowable.just(1).takeLast(1).subscribe(s);
          s.assertValue(1);
          s.assertNoErrors();
          s.assertTerminated();
          // NO longer assertable
  //      s.assertUnsubscribed();
      }
  
      @Test
      public void testUnsubscribesFromUpstream() {
          final AtomicBoolean unsubscribed = new AtomicBoolean(false);
          Action unsubscribeAction = new Action() {
              @Override
              public void run() {
                  unsubscribed.set(true);
              }
          };
  
          Flowable.just(1).concatWith(Flowable.<Integer>never())
          .doOnCancel(unsubscribeAction)
          .takeLast(1)
          .subscribe().dispose();
  
          assertTrue(unsubscribed.get());
      }
  
      @Test
      public void testLastWithBackpressure() {
          MySubscriber<Integer> s = new MySubscriber<Integer>(0);
          Flowable.just(1).takeLast(1).subscribe(s);
          assertEquals(0, s.list.size());
          s.requestMore(1);
          assertEquals(1, s.list.size());
      }
  
      @Test
      public void testTakeLastZeroProcessesAllItemsButIgnoresThem() {
          final AtomicInteger upstreamCount = new AtomicInteger();
          final int num = 10;
          long count = Flowable.range(1,num).doOnNext(new Consumer<Integer>() {
  
              @Override
              public void accept(Integer t) {
                  upstreamCount.incrementAndGet();
              }})
              .takeLast(0).count().blockingLast();
          assertEquals(num, upstreamCount.get());
          assertEquals(0L, count);
      }
  
      private static class MySubscriber<T> extends DefaultSubscriber<T> {
  
          private long initialRequest;
  
          MySubscriber(long initialRequest) {
              this.initialRequest = initialRequest;
          }
  
          final List<T> list = new ArrayList<T>();
  
          public void requestMore(long n) {
              request(n);
          }
  
          @Override
          public void onStart() {
              request(initialRequest);
          }
  
          @Override
          public void onComplete() {
  
          }
  
          @Override
          public void onError(Throwable e) {
  
          }
  
          @Override
          public void onNext(T t) {
              list.add(t);
          }
  
      }
  
      @Test
      public void dispose() {
          TestHelper.checkDisposed(Flowable.just(1).takeLast(1));
      }
  
      @Test
      public void doubleOnSubscribe() {
          TestHelper.checkDoubleOnSubscribeFlowable(new Function<Flowable<Object>, Flowable<Object>>() {
              @Override
              public Flowable<Object> apply(Flowable<Object> f) throws Exception {
                  return f.takeLast(1);
              }
          });
      }
  
      @Test
      public void error() {
          Flowable.error(new TestException())
          .takeLast(1)
          .test()
          .assertFailure(TestException.class);
      }
  }
  